Sleeve bellows sealed control valves, regulators adopt compact sleeve valve structure, the upper cover adopts double-layer structure of bellows and fillers, which has the characteristics of large allowable pressure difference and stable operation. It can be widely used in the regulation of highly toxic, highly corrosive, radioactive, volatile and permeable media, as well as in process pipes. Road requirements for vacuum occasions.
Specification model
□Main technical parameters
○Main technical parameters of regulating mechanism
Note: 1, in addition to the special requirements of users, they are supplied by the standard spring range of 20kPa ~ 100kPa.
2, for the selected nominal diameter, if no user specified, the maximum Kv value will be supplied. Smaller Kv than table
Value products can be settled with our company.
Performance index
Basic error: + 2.5% (with positioner)
Return error: 2.5% (with locator)
Dead zone: 1% (with locator)
Leakage: 5 * 10-3 valve rated capacity
Rated discharge coefficient: + 10%
Inherent flow characteristics: slope + 30%
Allowable pressure difference
Pneumatic sleeve bellows seal control valve allowed differential gauge MPa
Note: 1.P - valve positioner, R - pressure relay (1:2).
2. if the maximum working pressure difference exceeds the list scope, it can be put forward to the factory and take appropriate solutions.
Inherent flow characteristic curve
Material of main parts
Body and bonnet: WCB, CF8, CF8M
Valve internals: 304, 316
Bellows: 304, 316
Filler: polytetrafluoroethylene
Gasket: Graphite wound gasket
Diaphragm: NBR reinforced polyester fabric.
Compression spring: 60Si2Mn
Note: if the user has other requirements for the material of the main parts, he may consult with our company.
Shape size
Size and weight
